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Bi-directional coupler

a bi-directional coupler and coupler technology, applied in the direction of coupling devices, multiple-port networks, electrical devices, etc., can solve the problem of requiring much effort in circuit design, and achieve the effect of easy bi-directionality

Active Publication Date: 2019-05-09
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide a bi-directional coupler that is easy to achieve bi-directionality. The coupler has a circuit configuration that is equivalent in both modes, making it bi-directional even if each individual directional coupler is not. This simplifies the process of achieving bi-directionality of the coupler.

Problems solved by technology

Conventionally, the realization of a bi-directional coupler requires spending much effort on the design of circuitry.

Method used

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Effect test

first embodiment

[0039]Preferred embodiments of the present invention will now be described in detail with reference to the drawings. First, reference is made to FIG. 1 to describe the circuit configuration of a bi-directional coupler according to a first embodiment of the invention.

[0040]As shown in FIG. 1, the bi-directional coupler 1 according to the first embodiment includes a first individual directional coupler 1A and a second individual directional coupler 1B. The first and second individual directional couples 1A and 1B are individual electronic components having mutually equivalent circuit configurations. Each of the first and second individual directional couplers 1A and 1B includes a first terminal 11, a second terminal 12, a third terminal 13, a fourth terminal 14, a main line 10 connecting the first terminal 11 and the second terminal 12, and a subline 20 connecting the third terminal 13 and the fourth terminal 14.

[0041]The subline 20 includes at least one coupling line section configur...

second embodiment

[0115]A bi-directional coupler 1 according to a second embodiment of the invention will now be described. FIG. 15 is a circuit diagram illustrating the circuit configuration of the bi-directional coupler 1 according to the second embodiment. The bi-directional coupler 1 according to the second embodiment includes neither of the first and second resistors 15A and 15B of the first embodiment, but includes a delay line 16 that electrically connects the fourth terminal 14 of the first individual directional coupler 1A and the fourth terminal 14 of the second individual directional coupler 1B. The delay line 16 causes a change in the phase of a signal passing therethrough. The magnitude of the change in the phase caused by the delay line 16 is more than 0° and 360° or less for a signal of a frequency within the service frequency band of the bi-directional coupler 1.

[0116]The bi-directional coupler 1 according to the present embodiment operates differently from the bi-directional coupler ...

third embodiment

[0128]A bi-directional coupler 1 according to a third embodiment of the invention will now be described. FIG. 18 is a circuit diagram illustrating the circuit configuration of the bi-directional coupler 1 according to the third embodiment. The bi-directional coupler 1 according to the third embodiment includes none of the first and second resistors 15A and 15B of the first embodiment and the delay line 16 of the second embodiment. In the bi-directional coupler 1 according to the third embodiment, the fourth terminal 14 of the second individual directional coupler 1B is electrically connected to the fourth terminal 14 of the first individual directional coupler 1A without the delay line 16 therebetween.

[0129]In the present embodiment, the fourth terminal 14 of the second individual directional coupler 1B may be physically directly connected to the fourth terminal 14 of the first individual directional coupler 1A, or may be electrically connected thereto via a short line that hardly c...

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Abstract

A bi-directional coupler includes a first individual directional coupler and a second individual directional coupler, which are individual electronic components having mutually equivalent circuit configurations. Each of the first and second individual directional couplers includes: a first terminal; a second terminal; a third terminal; a fourth terminal; a main line connecting the first terminal and the second terminal; and a subline connecting the third terminal and the fourth terminal. The subline includes first and second coupling line sections configured to be electromagnetically coupled to the main line, and a matching section provided between the first and second coupling line sections. The second terminal of the second individual directional coupler is electrically connected to the second terminal of the first individual directional coupler.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The present invention relates to a bi-directional coupler.2. Description of the Related Art[0002]Directional couplers are used for detecting the levels of transmission / reception signals in transmission / reception circuits of wireless communication apparatuses such as cellular phones and wireless LAN communication apparatuses.[0003]A directional coupler configured as follows is known as a conventional directional coupler. The directional coupler has an input port, an output port, a coupling port, a termination port, a main line connecting the input port and the output port, and a subline connecting the coupling port and the termination port. The subline includes a coupling line section configured to be electromagnetically coupled to the main line. The termination port is grounded via a termination resistor having a resistance of 50Ω, for example. The input port receives a high frequency signal, and the output port outputs the s...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01P5/18H03H7/38H01P1/24
CPCH01P5/18H03H7/38H01P1/24H01P5/187
Inventor OOTSUKA, NORIAKIYOSHIDA, KEISUKE
Owner TDK CORPARATION
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